/* 
* jQuery Highlight plugin 
* 
* Based on highlight v3 by Johann Burkard 
* http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html 
* 
* Code a little bit refactored and cleaned (in my humble opinion). 
* Most important changes: 
*  - has an option to highlight only entire words (wordsOnly - false by default), 
*  - has an option to be case sensitive (caseSensitive - false by default) 
*  - highlight element tag and class names can be specified in options 
* 
* Usage: 
*   // wrap every occurrance of text 'lorem' in content 
*   // with <span class='highlight'> (default options) 
*   $('#content').highlight('lorem'); 
* 
*   // search for and highlight more terms at once 
*   // so you can save some time on traversing DOM 
*   $('#content').highlight(['lorem', 'ipsum']); 
*   $('#content').highlight('lorem ipsum'); 
* 
*   // search only for entire word 'lorem' 
*   $('#content').highlight('lorem', { wordsOnly: true }); 
* 
*   // don't ignore case during search of term 'lorem' 
*   $('#content').highlight('lorem', { caseSensitive: true }); 
* 
*   // wrap every occurrance of term 'ipsum' in content 
*   // with <em class='important'> 
*   $('#content').highlight('ipsum', { element: 'em', className: 'important' }); 
* 
*   // remove default highlight 
*   $('#content').unhighlight(); 
* 
*   // remove custom highlight 
*   $('#content').unhighlight({ element: 'em', className: 'important' }); 
* 
* 
* Copyright (c) 2009 Bartek Szopka 
* 
* Licensed under MIT license. 
* 
*/

jQuery.extend({    
	highlight: function (node, re, nodeName, className) {        
		if (node.nodeType === 3) {            
			var match = node.data.match(re);            
			if (match) {                
				var highlight = document.createElement(nodeName || 'span');                
				highlight.className = className || 'highlight';                
				var wordNode = node.splitText(match.index);                
				wordNode.splitText(match[0].length);                
				var wordClone = wordNode.cloneNode(true);                
				highlight.appendChild(wordClone);                
				wordNode.parentNode.replaceChild(highlight, wordNode);                
				return 1; //skip added node in parent            
			}        
		} else if ((node.nodeType === 1 && node.childNodes) && // only element nodes that have children
				!/(script|style)/i.test(node.tagName) && // ignore script and style nodes
				!(node.tagName === nodeName.toUpperCase() && node.className === className)) { // skip if already highlighted            
			for (var i = 0; i < node.childNodes.length; i++) {                
				i += jQuery.highlight(node.childNodes[i], re, nodeName, className);            
			}        
		}        
		return 0;    
	}
});
	
jQuery.fn.unhighlight = function (options) {    
	var settings = { className: 'highlight', element: 'span' };    
	jQuery.extend(settings, options);    
	
	return this.find(settings.element + "." + settings.className).each(function () {        
		var parent = this.parentNode;        
		parent.replaceChild(this.firstChild, this);        
		parent.normalize();    
	}).end();
};
	
jQuery.fn.highlight = function (words, options) {    
	var settings = { className: 'highlight', element: 'span', caseSensitive: false, wordsOnly: false };    
	jQuery.extend(settings, options);        
	
	if (words.constructor === String) {        
		words = [words];    
	}    
	words = jQuery.grep(words, function(word, i){      
		return word != '';    
	});    
	if (words.length == 0) { return this; };    
	
	var flag = settings.caseSensitive ? "" : "i";    
	var pattern = "(" + words.join("|") + ")";    
	if (settings.wordsOnly) {        
		pattern = "\\b" + pattern + "\\b";    
	}    
	var re = new RegExp(pattern, flag);        
	
	return this.each(function () {        
		jQuery.highlight(this, re, settings.element, settings.className);    
	});
};

